International Association for Cryptologic Research

International Association
for Cryptologic Research

IACR News item: 13 April 2012

J.H.Zhang, Y.B.cui
ePrint Report ePrint Report
Anonymous receiver encryption is an important cryptographic

primitive. It can protect the privacy of the receiver. In 2010, Fan

\\emph{et al} proposed an anonymous multi-receiver ID-based

encryption by using Lagrange interpolating polynomial. Recently,

Wang \\emph{et al} showed that Fan \\emph{et al}\'s scheme satisfied

anonymity of the receivers. Then they provided an improved scheme to

fix it and showed that the improved scheme was secure.

Unfortunately, we pointed out that Wang \\emph{et al}\'s improved

scheme did\'t satisfy the receiver\'s anonymity by analyzing the

security of the scheme yet. After analyzing the reason to produce

such flaw, we give an improved method to repair it and show that our

improved scheme satisfies the receiver\'s anonymity.

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